From: henry@spsystems.net   
      
   In article ,   
   Paul F. Dietz  wrote:   
   >> Considering that there are a few atoms per cubic _meters_, it might be   
   >> detectable with appropriate instruments, but would certainly not be   
   >> visible...   
   >   
   >The density of the ISM is on the rough order of an atom per cubic centimeter.   
      
   No, that's an old number.  The "Local Cloud" in which we sit is about   
   0.07 atom/cc, and the "Local Bubble" outside that (several hundred LY   
   across) is down around 0.005 atom/cc.   
   --   
   MOST launched 30 June; first light, 29 July; 5arcsec    | Henry Spencer   
   pointing, 10 Sept; first science, early Oct; all well.  | henry@spsystems.net   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)